Tripoli: Aircraft attacked a convoy carrying suspected IS militants near the northwestern Libyan town of Bani Walid early on Sunday, an official said.
No group claimed responsibility for the attack though both the United States and Libyan government forces have launched air strikes on extremists in recent months.
Three huge explosions rocked the area around dawn, the member of Bani Walid's municipal council told Reuters.
People living in Ras Al Tbel, about 80 km (50 miles) south-east of Bani Walid, had seen the same convoy of up to 15 vehicles carrying the markings of IS over the past two days, the official added.
It was not immediately clear if the convoy was hit.
Extremist groups have taken advantage of political chaos to expand their presence in Libya and fighters loyal to IS have taken control of the coastal city of Sirte, about 260km (160 miles) east of Bani Walid.
Western officials say they are discussing air strikes and special forces operations in Libya against the group.
US aircraft attacked a suspected IS training camp on the outskirts of the western Libyan city of Sabratha this month, and launched two more air strikes against extremist commanders in Libya last year.